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We have used the Swedish ESO Submillimetre Telescope (SEST) to search for newclass II methanol maser transitions towards the southern source G345.01+1.79.Over a period of 5 days we observed 11 known or predicted class II methanolmaser transitions. Emission with the narrow line width and characteristicvelocity of class II methanol masers (in this source) was detected in 8 ofthese transitions, two of which have not previously been reported as masers.The new class II methanol maser transitions are the 13(-3)-12(-4)E transitionat 104.1 GHz and the 5(1)-4(2)E transition at 216.9 GHz. Both of these are fromtransition series for which there are no previous known class II methanol masertransitions. This takes the total number of known class II methanol maserseries to 10, and the total number of transitions (or transition groups) to 18.The observed 104.1 GHz maser suggests the presence of two or more regions ofmasing gas with similar line of sight velocities, but quite different physicalconditions. Although these newly discovered transitions are likely to berelatively rare, where they are observed combined studies using the AustraliaTelescope Compact Array and the Atacama Large Millimeter Array offer theprospect to be able to undertake multi-transition methanol maser studies withunprecedented detail.

Discovery of Two New Class II Methanol Maser Transitions in G345.01+1.79